/Engine/Source/Runtime/MovieSceneTracks/Public/Systems/MovieSceneInitialValueSystem.h
System responsible for initializing initial values for all property types Will handle the presence of an FInitialValueCache extension on the linker
class UMovieSceneInitialValueSystem : public [UMovieSceneEntityInstantiatorSystem](API\Runtime\MovieScene\EntitySystem\UMovieSceneEntityInstantiatorSys-)